import java.math.BigInteger;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        BigInteger[] nums = new BigInteger[3];
        while (scanner.hasNext()) {
            for(int i = 0; i<3; i++) {
                nums[i] = new BigInteger(scanner.next());
            }
            Arrays.sort(nums);
            if(nums[0].add(nums[1]) .compareTo(nums[2]) <= 0) {
                System.out.println("No");
            }else {
                System.out.println("Yes");
            }
        }
    }
}
